I agree that the Regen is wasted points. If you want a Skyblight, it would be best to add a
CAD that adds Synapse. That will also allow more Tyrants if you find the need.
You may find LOW is too much at 1850, so you might want to proxy before you spend money.

If it is too big a couple more Tyrants makes a fierce army.
A
CAD can be as little as a Winged Tyrant, a Malanthrope, and Two Broods of Rippers.